牵涉到一些API函数
比如:
Public Declare Function CreatePolygonRgn Lib "gdi32" Alias "CreatePolygonRgn" (lpPoint As POINTAPI, ByVal nCount As Long, ByVal nPolyFillMode As Long) As Long
Public Declare Function SetWindowRgn Lib "user32" Alias "SetWindowRgn" (ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Boolean) As Long
Public Declare Function GetDC Lib "user32" Alias "GetDC" (ByVal hwnd As Long) As Long
等 相关的API 你可以去www.vbaspnew.com 看看相关的列子